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Boys' activewear tops are ideal for the busy little men in your life. You'll never pay retail for these hard-wearing apparel items again when you shop at thredUP.

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54 items
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    Lands' End Active T-Shirt (view 2)Lands' End Active T-Shirt (view 1)
    View Product: Lands' End Active T-Shirt

    Lands' End

    Active T-Shirt
    Size 10
    $11.99 $6.59 45% off with code GOBIG
    63% off estimated retail
    Adidas Active T-Shirt (view 2)Adidas Active T-Shirt (view 1)
    View Product: Adidas Active T-Shirt

    Adidas

    Active T-Shirt
    Size 10
    $12.99 $7.14 45% off with code GOBIG
    68% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size Medium youth
    $21.99 $12.09 45% off with code GOBIG
    46% off estimated retail
    Adidas Active T-Shirt (view 2)Adidas Active T-Shirt (view 1)
    View Product: Adidas Active T-Shirt

    Adidas

    Active T-Shirt
    Size Large kids
    $17.99 $9.89 45% off with code GOBIG
    56% off estimated retail
    The Edit. Forever Classic, Get perfectly polished in trousers, blazers, and more. Shop The Edit
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)Flawed Gem
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size 7
    $13.99 $7.69 45% off with code GOBIG
    48% off estimated retail
    Adidas Active T-Shirt (view 2)Adidas Active T-Shirt (view 1)
    View Product: Adidas Active T-Shirt

    Adidas

    Active T-Shirt
    Size 14
    $13.99 $7.69 45% off with code GOBIG
    65% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size Medium youth
    $21.99 $12.09 45% off with code GOBIG
    46% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size Medium youth
    $18.99 $10.44 45% off with code GOBIG
    53% off estimated retail
    Nike Active T-Shirt (view 2)Nike Active T-Shirt (view 1)
    View Product: Nike Active T-Shirt

    Nike

    Active T-Shirt
    Size Medium kids
    $14.99 $8.24 45% off with code GOBIG
    63% off estimated retail
    Adidas Active Tank (view 2)Adidas Active Tank (view 1)
    View Product: Adidas Active Tank

    Adidas

    Active Tank
    Size 9
    $11.99 $6.59 45% off with code GOBIG
    70% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size Small youth
    $16.99 $9.34 45% off with code GOBIG
    58% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size Large youth
    $20.99 $11.54 45% off with code GOBIG
    48% off estimated retail
    Laguna Active T-Shirt (view 2)Laguna Active T-Shirt (view 1)
    View Product: Laguna Active T-Shirt

    Laguna

    Active T-Shirt
    Size 4
    $8.99 $4.94 45% off with code GOBIG
    55% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size Medium youth
    $17.99 $9.89 45% off with code GOBIG
    56% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size 4T
    $13.99 $7.69 45% off with code GOBIG
    58% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size Medium youth
    $22.99 $12.64 45% off with code GOBIG
    43% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size Small youth
    $17.99 $9.89 45% off with code GOBIG
    56% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size X-Small youth
    $21.99 $12.09 45% off with code GOBIG
    46% off estimated retail
    Nike Active T-Shirt (view 2)Nike Active T-Shirt (view 1)
    View Product: Nike Active T-Shirt

    Nike

    Active T-Shirt
    Size X-Small kids
    $14.99 $8.24 45% off with code GOBIG
    55% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)Flawed Gem
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size Large youth
    $11.99 $6.59 45% off with code GOBIG
    55% off estimated retail
    Nike Active T-Shirt (view 2)Nike Active T-Shirt (view 1)
    View Product: Nike Active T-Shirt

    Nike

    Active T-Shirt
    Size Small kids
    $12.99 $7.14 45% off with code GOBIG
    61% off estimated retail
    Nike Active T-Shirt (view 2)Nike Active T-Shirt (view 1)
    View Product: Nike Active T-Shirt

    Nike

    Active T-Shirt
    Size Large kids
    $13.99 $7.69 45% off with code GOBIG
    65% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size 7
    $17.99 $9.89 45% off with code GOBIG
    56% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size Large youth
    $19.99 $10.99 45% off with code GOBIG
    51% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size X-Large youth
    $19.99 $10.99 45% off with code GOBIG
    51% off estimated retail
    Cappelli Active T-Shirt (view 2)Cappelli Active T-Shirt (view 1)
    View Product: Cappelli Active T-Shirt

    Cappelli

    Active T-Shirt
    Size 8
    $8.99 $4.94 45% off with code GOBIG
    64% off estimated retail
    Adidas Active T-Shirt (view 2)Adidas Active T-Shirt (view 1)
    View Product: Adidas Active T-Shirt

    Adidas

    Active T-Shirt
    Size 3 mo
    $13.99 $7.69 45% off with code GOBIG
    48% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size X-Large youth
    $17.99 $9.89 45% off with code GOBIG
    56% off estimated retail
    Spyder Active T-Shirt (view 2)Spyder Active T-Shirt (view 1)
    View Product: Spyder Active T-Shirt

    Spyder

    Active T-Shirt
    Size Small kids
    $18.99 $10.44 45% off with code GOBIG
    72% off estimated retail
    Champion Active T-Shirt (view 2)Champion Active T-Shirt (view 1)
    View Product: Champion Active T-Shirt

    Champion

    Active T-Shirt
    Size 2T
    $11.99 $6.59 45% off with code GOBIG
    25% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size Large youth
    $19.99 $10.99 45% off with code GOBIG
    51% off estimated retail
    Spyder Active T-Shirt (view 2)Spyder Active T-Shirt (view 1)
    View Product: Spyder Active T-Shirt

    Spyder

    Active T-Shirt
    Size 10
    $15.99 $8.79 45% off with code GOBIG
    80% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size Medium youth
    $18.99 $10.44 45% off with code GOBIG
    53% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size X-Large youth
    $21.99 $12.09 45% off with code GOBIG
    46% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size X-Small youth
    $19.99 $10.99 45% off with code GOBIG
    51% off estimated retail
    Active by Old Navy Active T-Shirt (view 2)Active by Old Navy Active T-Shirt (view 1)
    View Product: Active by Old Navy Active T-Shirt

    Active by Old Navy

    Active T-Shirt
    Size 8
    $11.99 $6.59 45% off with code GOBIG
    40% off estimated retail
    Under Armour Active Tank (view 2)Under Armour Active Tank (view 1)
    View Product: Under Armour Active Tank

    Under Armour

    Active Tank
    Size Large youth
    $16.99 $9.34 45% off with code GOBIG
    58% off estimated retail
    Reebok Active T-Shirt (view 2)Reebok Active T-Shirt (view 1)
    View Product: Reebok Active T-Shirt

    Reebok

    Active T-Shirt
    Size 24 mo
    $7.99 $4.39 45% off with code GOBIG
    70% off estimated retail
    Apex Active T-Shirt (view 2)Apex Active T-Shirt (view 1)
    View Product: Apex Active T-Shirt

    Apex

    Active T-Shirt
    Size Small youth
    $9.99 $5.49 45% off with code GOBIG
    37% off estimated retail
    Apex Active T-Shirt (view 2)Apex Active T-Shirt (view 1)
    View Product: Apex Active T-Shirt

    Apex

    Active T-Shirt
    Size Small youth
    $9.99 $5.49 45% off with code GOBIG
    37% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size X-Small youth
    $21.99 $12.09 45% off with code GOBIG
    46% off estimated retail
    Decathlon Active T-Shirt (view 2)Decathlon Active T-Shirt (view 1)Price Drop
    View Product: Decathlon Active T-Shirt

    Decathlon

    Active T-Shirt
    Size 10
    $16.99 $9.34 45% off with code GOBIG
    65% off estimated retail
    Nike Active Tank (view 2)Nike Active Tank (view 1)Price Drop
    View Product: Nike Active Tank

    Nike

    Active Tank
    Size X-Small kids
    $12.99 $7.14 45% off with code GOBIG
    61% off estimated retail
    Pro Player Active T-Shirt (view 2)Pro Player Active T-Shirt (view 1)Price Drop
    View Product: Pro Player Active T-Shirt

    Pro Player

    Active T-Shirt
    Size 2T
    $8.99 $4.94 45% off with code GOBIG
    18% off estimated retail
    New Balance Active T-Shirt (view 2)New Balance Active T-Shirt (view 1)Price Drop
    View Product: New Balance Active T-Shirt

    New Balance

    Active T-Shirt
    Size 10
    $11.99 $6.59 45% off with code GOBIG
    75% off estimated retail
    C9 By Champion Active T-Shirt (view 2)C9 By Champion Active T-Shirt (view 1)Price Drop
    View Product: C9 By Champion Active T-Shirt

    C9 By Champion

    Active T-Shirt
    Size Medium kids
    $10.99 $6.04 45% off with code GOBIG
    31% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)Price Drop
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size X-Large youth
    $12.99 $7.14 45% off with code GOBIG
    68% off estimated retail
    Nike Active T-Shirt (view 2)Nike Active T-Shirt (view 1)Price Drop
    View Product: Nike Active T-Shirt

    Nike

    Active T-Shirt
    Size Small infants
    $10.99 $6.04 45% off with code GOBIG
    59% off estimated retail
    Adidas Active T-Shirt (view 2)Adidas Active T-Shirt (view 1)Price Drop
    View Product: Adidas Active T-Shirt

    Adidas

    Active T-Shirt
    Size 6 mo
    $9.99 $5.49 45% off with code GOBIG
    63% off estimated retail
    Hang Ten Active T-Shirt (view 2)Hang Ten Active T-Shirt (view 1)Price Drop
    View Product: Hang Ten Active T-Shirt

    Hang Ten

    Active T-Shirt
    Size Large kids
    $9.99 $5.49 45% off with code GOBIG
    37% off estimated retail
    Augusta Sportswear Active T-Shirt (view 2)Augusta Sportswear Active T-Shirt (view 1)Price Drop
    View Product: Augusta Sportswear Active T-Shirt

    Augusta Sportswear

    Active T-Shirt
    Size Small youth
    $9.99 $5.49 45% off with code GOBIG
    60% off estimated retail
    Adidas Active T-Shirt (view 2)Adidas Active T-Shirt (view 1)Price Drop
    View Product: Adidas Active T-Shirt

    Adidas

    Active T-Shirt
    Size 3 mo
    $8.99 $4.94 45% off with code GOBIG
    65% off estimated retail
    Free Country Active Tank (view 2)Free Country Active Tank (view 1)Price Drop
    View Product: Free Country Active Tank

    Free Country

    Active Tank
    Size 5
    $6.99 $3.84 45% off with code GOBIG
    46% off estimated retail
    Nike Active T-Shirt (view 2)Nike Active T-Shirt (view 1)Price Drop
    View Product: Nike Active T-Shirt

    Nike

    Active T-Shirt
    Size Small kids
    $8.99 $4.94 45% off with code GOBIG
    71% off estimated retail
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